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diff --git a/libstdc++/include/c_std/cmath.tcc b/libstdc++/include/c_std/cmath.tcc
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+++ b/libstdc++/include/c_std/cmath.tcc
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+// -*- C++ -*- C math library.
+
+// Copyright (C) 2000, 2003, 2004, 2006 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+// As a special exception, you may use this file as part of a free software
+// library without restriction.  Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License.  This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+// This file was written by Gabriel Dos Reis <gdr@codesourcery.com>
+
+/** @file cmath.tcc
+ *  This is a Standard C++ Library file.
+ */
+
+#ifndef _GLIBCXX_CMATH_TCC
+#define _GLIBCXX_CMATH_TCC 1
+
+_GLIBCXX_BEGIN_NAMESPACE(std)
+
+  template<typename _Tp>
+    inline _Tp
+    __cmath_power(_Tp __x, unsigned int __n)
+    {
+      _Tp __y = __n % 2 ? __x : 1;
+
+      while (__n >>= 1)
+        {
+          __x = __x * __x;
+          if (__n % 2)
+            __y = __y * __x;
+        }
+
+      return __y;
+    }
+
+_GLIBCXX_END_NAMESPACE
+
+#endif